261541651106 has 8 divisors (see below), whose sum is σ = 392314671660. Its totient is φ = 130770093888.

The previous prime is 261541651103. The next prime is 261541651109. The reversal of 261541651106 is 601156145162.

It is an interprime number because it is at equal distance from previous prime (261541651103) and next prime (261541651109).

It can be written as a sum of positive squares in 2 ways, for example, as 248393588881 + 13148062225 = 498391^2 + 114665^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 261541651106.

It is not an unprimeable number, because it can be changed into a prime (261541651103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 410390 + ... + 831566.

Almost surely, 2^261541651106 is an apocalyptic number.

261541651106 is a deficient number, since it is larger than the sum of its proper divisors (130773020554).

261541651106 is a wasteful number, since it uses less digits than its factorization.

261541651106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 731668.

The product of its (nonzero) digits is 43200, while the sum is 38.

Adding to 261541651106 its reverse (601156145162), we get a palindrome (862697796268).

The spelling of 261541651106 in words is "two hundred sixty-one billion, five hundred forty-one million, six hundred fifty-one thousand, one hundred six".